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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5387c2f9be7b879ef2cce877ea541e1c8ab39ed857aab212aee0a3fec602fe24' 
  AND token = 'B0YXQ+F9yOWoormq+bQrRvOgDKYSP0TRz/Co/16tgnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}